tag:blogger.com,1999:blog-12927525757902901722024-03-07T22:34:20.421-08:00SynthRaysa free to use, browser based optical simulation software for education and hobbyKrisztián Nagyhttp://www.blogger.com/profile/07441115154281835570noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1292752575790290172.post-31869686551550825772012-01-04T12:07:00.001-08:002012-04-06T06:22:09.404-07:00Lesson 2: reversed lens as a close-up lens- load (open) the 28.5mm wide angle lens for SLR (28.24mm)<br />- invert all<br />- shift all lenses by -52mm<br />- load (open&add) the 100mm telephoto lens (99.74mm)<br /><br />the calculated magnification = 99.74mm / 28.24mm = 3.53 (or 3.53:1)<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps10.jpg"><br /><br />- switch to simulation mode<br />- do not move the sensor (telephoto lens is focused to infinity)<br />- decrease the object distance until focus reaches the sensor (39mm)<br />- switch on the second object<br />- give some angle or height to any object<br />- read the measured magnification<br /><br />measured magnification = 3.53<br /><br />- select lenses from No. 1 to No. 7 (elements of the wide angle lens)<br />- move them along Z axis by uppermost adjustment<br />- let see how independent the magnification isKrisztián Nagyhttp://www.blogger.com/profile/07441115154281835570noreply@blogger.com0tag:blogger.com,1999:blog-1292752575790290172.post-26242156081138147262011-12-27T04:14:00.000-08:002011-12-27T04:19:36.233-08:00New lens in the example package!Data of a simple 100mm 1:2.8 telephoto lens are available (4 lenses in 4 groups).<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps9.jpg">Krisztián Nagyhttp://www.blogger.com/profile/07441115154281835570noreply@blogger.com0tag:blogger.com,1999:blog-1292752575790290172.post-78014044553130151272011-12-19T16:15:00.000-08:002011-12-19T16:20:29.104-08:00Example files are available!You can download the example package from <a href="http://nagykrisztian.com/synthrays/synthrays_examples.zip">here</a>, and it contains the following lenses:<br /><br />- normal lens for rangefinder cameras (50mm 1:2 - 6 lenses in 3 groups)<br />- double-gauss normal lens for rangefinder cameras (50mm 1:2 - 6 lenses in 4 groups)<br />- long telephoto lens (170mm 1:3.5 - 9 lenses in 8 groups)<br />- wide angle lens for rangefinder cameras (20mm 1:4 - 9 lenses in 4 groups)<br />- wide angle lens for rangefinder cameras (35mm 1:2.8 - 7 lenses in 4 groups)<br />- wide angle lens for SLR cameras (28.5mm 1:2.8 - 7 lenses in 6 groups)<br />- close-up lenses: 1D, 2D and 3D<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps7.jpg"><br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps8.jpg">Krisztián Nagyhttp://www.blogger.com/profile/07441115154281835570noreply@blogger.com0tag:blogger.com,1999:blog-1292752575790290172.post-77227021381801766122011-12-18T09:54:00.001-08:002012-04-06T06:22:51.876-07:00The first lesson: the effect of close-up lenses- let us suppose that you have a normal lens<br />- specification shows 1:10 (0,1x) maximum magnification<br />- download the example package and unzip it<br />- press the open button, find the downloaded examples<br />- select the "normal_simple.txt" file and load it<br />- press the simulation button<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps1.jpg"><br /><br />- the focal point located on the sensor<br />- switch on the second object<br />- give a not zero angle to the object<br />- decrease the object distance until magnification reaches the specified maximum value<br />- click on distance input field and use arrow keys to fine adjustment<br />- read the minimum focusing distance (from front vertex, not from the sensor)<br />- the focus located beind the sensor now<br />- move a "Z" cursor over the focus, and read the cursor position<br />- the distance between the sensor and the cursor is the maximum mechanical extension of the lens<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps2.jpg"><br /><br />- press the editing and preferences button after<br />- memorize the position of sensor<br />- type in the cursor position into the sensor position input field<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps3.jpg"><br /><br />- the focus located on the sensor again<br />- go back to editing<br />- press Open & Add button<br />- select the 2D close-up lens<br />- go back to simulation<br />- the focus located before the sensor now<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps4.jpg"><br /><br />- decrease the object distance until focus touches the sensor<br />- read the new magnification, this is the gain of the close-up lens<br />- read the new minimum focusing distance <br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps5.jpg"><br /><br />- go to preferences<br />- set the sensor position to the original value<br />- go to simulation<br />- increase the object distance until focus touches the sensor<br />- read the new maximum focusing distance (instead of infinite)<br /><br /><img src="http://nagykrisztian.com/synthrays/blog/sr_ps6.jpg">Krisztián Nagyhttp://www.blogger.com/profile/07441115154281835570noreply@blogger.com0